Abstract
Creep experiments were conducted on ice crystals in compression to investigate the effects of boundary conditions on a single-slip system deformed in plane strain. Friction at the platens of the deformation apparatus introduces a bending moment which causes a variation in the amount of lattice rotation across the specimen. This is shown to occur in mechanically constrained crystals observed through plane polarized light. Relieving the constraints and minimizing friction at the ice-platen contact leads to the widening of the sample near the specimen-platen interface and the production of ‘tails’ symmetrically disposed about the longitudinal axis of the deformed crystals. This is interpreted to originate from a bending moment in the opposite sense from that obtained in the constrained crystals, resulting from a progressive increase in slip displacement towards the platens where the segments of the slip plane become shorter. When the crystal ends were constrained but allowed to move sideways, a simple shear regime was established in which lattice slip was concentrated in the centre of the crystal.
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Barrette, P.D., Sinha, N.K., Stander, E. et al. The effects of boundary conditions on the basal glide of ice crystals in compression. JOURNAL OF MATERIALS SCIENCE 30, 63–68 (1995). https://doi.org/10.1007/BF00352132
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DOI: https://doi.org/10.1007/BF00352132